Exposing typing for hidden host property in PlayerOptions

types/youtube/index.d.ts

@@ -4,6 +4,7 @@
 //                 Ian Obermiller <http://ianobermiller.com>,
 //                 Josh Goldberg <https://github.com/JoshuaKGoldberg>
 //                 Eliot Fallon <https://github.com/eliotfallon213>
+//                 Terry Mun <https://github.com/terrymun>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.1
 
@@ -394,6 +395,11 @@ declare namespace YT
 		 * Handlers for events fired by the player.
 		 */
 		events?: Events;
+
+		/**
+		 * Points host to correct origin for CORS
+		 */
+		host?: string;
 	}
 
 	/**